Implement SecurityHandler to send the lock icon status to DevTools.

content/browser/devtools/protocol/security_handler.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "content/browser/devtools/protocol/security_handler.h"
+
+#include <string>
+
+namespace content {
+namespace devtools {
+namespace security {
+
+typedef DevToolsProtocolClient::Response Response;
+
+SecurityHandler::SecurityHandler() : enabled_(false), host_(nullptr) {
+}
+
+SecurityHandler::~SecurityHandler() {
+}
+
+void SecurityHandler::SetClient(scoped_ptr<Client> client) {
+  client_.swap(client);
+}
+
+void SecurityHandler::SetRenderFrameHost(RenderFrameHost* host) {
+  host_ = host;
+  if (enabled_ && host_)
+    WebContentsObserver::Observe(WebContents::FromRenderFrameHost(host_));
+}
+
+void SecurityHandler::SecurityStyleChanged(SecurityStyle security_style) {
+  if (!enabled_)
+    return;
+
+  const std::string security_state =
+      SecurityStyleToProtocolSecurityState(security_style);
+  client_->SecurityStateChanged(
+      SecurityStateChangedParams::Create()->set_security_state(security_state));
+}
+
+Response SecurityHandler::Enable() {
+  enabled_ = true;
+  if (host_)
+    WebContentsObserver::Observe(WebContents::FromRenderFrameHost(host_));
+  return Response::OK();
+}
+
+Response SecurityHandler::Disable() {
+  enabled_ = false;
+  WebContentsObserver::Observe(nullptr);
+  return Response::OK();
+}
+
+std::string SecurityHandler::SecurityStyleToProtocolSecurityState(
+    SecurityStyle security_style) {
+  // TODO: Replace these values with literals once the Security domain has
+  // landed in protocol.json.
+  switch (security_style) {
+    case SECURITY_STYLE_UNKNOWN:
+      return "unknown";

[lgarron, 2015/06/09 18:33:56]

estark@: Since this value can theoretically be passed in, what do you think of
adding "unknown" to protocol.json?

+    case SECURITY_STYLE_UNAUTHENTICATED:
+      return kSecurityStateHttp;
+    case SECURITY_STYLE_AUTHENTICATION_BROKEN:
+      return kSecurityStateInsecure;
+    case SECURITY_STYLE_WARNING:
+      return kSecurityStateWarning;
+    case SECURITY_STYLE_AUTHENTICATED:
+      return kSecurityStateSecure;
+    default:
+      NOTREACHED();
+  }
+}
+
+}  // namespace security
+}  // namespace devtools
+}  // namespace content